Reaktion a: (3) wurde nach Vogel et al.1'-31 rnit n-Butyllithium in die Dilithiumverbindung (wasserfreier Et20, -20 bis O"C, N,) umgewandelt, aus der sich durch Metallaustausch rnit wasserfreiem MgBr2 die bifunktionelle Grignard-Verbindung gewinnen lien. Setzte man diese bei 0 °C mit frisch bereitet
1H-NMR-untersuchungen an sialinsäuren markierung von N-acetyl-D-neuraminsäure mit deuterium
✍ Scribed by Horst Friebolin; Hermann Schmidt; Martin Supp
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- French
- Weight
- 235 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
An efficient method for the deuteration of N-acetyl-D-neuraninicacid (NeuAc) at C-3 is described. In alkaline D20 solution both protons of NeuAc (H3a and H3e) will be substituted by deuterium, whereby the substitution effect was found to be faster for H3a than for H3e . The rate of this exchange depends strongly on the pD value: the rate increases with increasing pD value. In acidic solution no effect could be observed. The process of H-D-exchange
📜 SIMILAR VOLUMES
The pD-dependence of the mutarotation of N-acetyl-D-neuraminic acid was studied by 'H-nmr spectroscopy. The rate constant has a minimum at pD 5.4. At pD 1.3 and pD 11.7 the establishment of the equilibrium of mutarotation was found to be so fast, that it cannot be measured.